Clamp for printers&#39; forms.



T. DEMPSTER, JR.

CLAMP FOR PRINTERS FORMS.

APPLIOATION FILED NOV. 27, 1912.

Patented Sepii. 16, 1913.

F' zz. 1%

7720)" a s fle-inwsl-er, Jr,

COLUMBIA PLANOGRAPH C0.. WASHINGTON. n. c.

UNITED sra'rns manna orrrcn.

THOMAS DEMPS'IER, JR., OF GRAND RAPIDS, MICHIGAN.

CLAMPFOR PRINTEBS FORMS.

Specification of Letters Patent. Pgmtgnted Sept 16, 1913, Application filed November 27, 1912 Seria1 No. 733,925.

To all whom it may concern:

Be it known that I, THOMAS DEMPSTER,

Jr., a citizen of the United States, resid tam new and useful Improvements in Clamps for Printers" Forms, of which the following is a specification. v

My invention relates to improvements in clamps for printing forms,and its objects are: First, to provide a clamp. with which the center of a typeform may be held firmly from sagging without in anyway subjecting the type to the danger of being marred by contact with the supporting,element. Second, to protect the surface ofthe type form from being marred by direct contact with the metal surface of the clamp, and,

third, to provide a clamp that will so secure a form of type that it may be-readily carried from place to place without danger of being broken up. I attain these objects by the mechanism illustrated in the accompanying drawing, in which- Figure 1 is an elevation of a type form with my appliance connected therewith.

Fig. 2 is a plan ofthe same. Fig. 3 is a bottom plan of the clamp. Fig. 4: is a like View of one end of the small end of the clamp. Fig. 5 is an end elevation of the small end of the clamp with the center type support in position. Fig. 6 is a perspective of the center type support detached from the clamp, and made upon a large scale, and Flg. 7 is a transverse section showing a square inner tube.

square tubing,

Similar letters refer to similar parts throughout the several views.

The bodyA of this clamp is made of and isprovided with a slot a. in the lower surface that the support F may'slide freely in, and with a slot a in the upper surface that the screw 0 may slide freely in, and with an arm athat is designed to pass down-upon the edge of the frame D, and is so arranged that the surface of the body A cannotcome in contact with the ends of the type in the form.

The slide 13 may be made of asolid square bar of metal, or of a square tube that will telescope perfectly into the tube or body A. This slide has an arm 6, corresponding with the arm a and for the same purpose. This slide is, also, provided with a slot, 6, the upper end of which is made T form so the upper end and T formed head of the support F may be made to slide freely in said slot and the head f will hold the support securely in the slot so that great weight may be supported thereby without danger of drawing the support F from its bearing 1n the slot b b; This slide is also provided with an opening 0 that the head 0 I of the bolt 0 may pass into and above the .upper surface of the head f of the support F, as the bolt is passed through its receiving hole in the slide B, as indicated in Fig.

5, so the support may bereadily slid from end to end of'the slot Nb without being obstructed by the head of said bolt. The bolt C passes through the slot a in the body tube. A and is engaged by a thumb nut C by: means of which it may be secured to place with suflicient strength to render it impossible for the slide B to slip in the body A. lVith this construction, it will be readily seen that the support F may be readily slid from one end to the other of the slot at for the purpose of adjusting it to a point as nearly central between the two ends of the extended clamp as possible, and said support may be readily slid out of the end of the bar B and disconnected therefrom, as is plainly indicated in Fig. 5.

When applying this clamp to a type form it is adjusted longitudinally to the exact length necessary to bring arms a, b, to bear snugly against the edges of the chase D and at the same time to take out a slug or type sufficient to allow the support F, (the body of which is of the exact thickness of the type or slug to be removed,) when the keying up of the type form will spread the form and chase sufiiciently to make the frame force heavily against the surfaces of the arms a and Z1, and at the same time the adjacent type will be forced against the surface of the support with such force that it becomes almost impossible to draw the type off of the support, even though the form may be of great weight.

While the clamp may be secured very firmly by means of a plain thumb screw or nut, as at C in Fig. 1, I prefer that a serrated surface, as shown at a in Fig. 2, be formed on the body A, and a corresponding square washer, as G, be placed between the surface of the body and. the screw or nut C, as indicated.

To avert all possible danger of the metal surface of the body A coming in contact with the letters on the type and marring in cases where the latter would be likely to occupy too much space.

What I claim as new, and desire to secure by Letters Patent of the United State's,1-is 1. In a form clamp for printing forms; a square tubular body having a slot through the lower surface and the upper surface, a

* barv made to telescope into said body and arm projecting at right angles from one having aT shaped slot in its lower surface, cl ampmg arms pr0 ect1ng downward from one end of each of said arts a securin 7 D bolt passed through the slot in the lower surface of the body and into theT shaped slot in the bar, said securing bolt having: a T shaped upper endto engage the T- shaped portion of said slot and a nut engaging said boltto lock the body and the bar firmly together.

2 A clamp adapted to be used-inconnection with a printers form, consisting of a tubular body having a slot through'both its upper surface and its lower surface, a bar V made to telescope into the body andhaving a T shaped slot in its lower surface, arms extending downward from one end of the body and of the bar, a T shaped supporting element fitted to slide freely in the T' shaped slot in the bar and to extend downward through the slot in the bodyand into the form between rows of type and be there clamped to support the center of the form, a and a bolt passing up through the bar and I the upper slot in the body, and a nut for firmly holdingthe body and bar from longitudinal movement.

3. A clamp adapted to be used-in connection with a printers form, consisting of a tubular body having a slot through the upper and the lower SlClOS, an arm projectingat rlght angles from one end, a bar 7 made to telescope into the body and having a T shaped slotv in the lower surface and an end, a T shaped supportingelenient made to slide freely in the T shaped slot and project downward through said slot and the slot in the body and projectfar enough to 'be engaged between two rows of type to support the center of the form, a bolt, projecting" from the bar up througlr'the upper 7.

slot in the::bodygsserrationrs formed on the upper surface of the body, a washer formed to engage SiLlChSBIIfittlOIlSp andnut for seif curelyl fastening thew y nd bar-together g a ng the bolt. 7

=4. A clamp.- adaptedto housed in connec- .tion-withsa printers form, consistingofa V tubular body having. properly arranged slots through its upper and lower walls,. an

arm projecting eat; right angles from one fend of the body, ar bar "fitted. to telescope into :the, body and having. a :Teshapedr,slot

in its underv surface an arm pro-j ecting .at

i right angles. from one. end of the bar, a supporting element fitted with" a T shaped end to slide ffre'ely insthe'T, shaped slot.,and;.to pass downward into the ziforrn and be clamped between .two rows ,of type to 1 support the center ofthe; form; a bolt :passing upwardthrough the bar. and the slot in the upper. wall of thebodya a nut engaging said bolt to secure .the body and: the bar; firmly L togethenrand-a pliable coatingbn the lower 1 surface of @the body.

5 In a clamp for printers for1ns,1a body having a slot throughb'oth the upper and the lower walls,'an arm: at rightangleswith oneendof the body, a bar telescopinginto the body and-having a T shaped slot in one 7 surface, an arm iat: right angles 'with 'one end of the bar, a supporting element having a T shapedf 'hea darranged to slidei-freely in-tl1e*'l'- shap ed slot and projecttdownward to be engaged in the form, a single bolt passing through the slot in the bo'dypf the bar and a nut for securing tl1e b0'dyand-bar together, serrations formed the upper suri face of the body, a washer formed to'i lie between the nut said -serratd upper surface, and a pliable coating on the'lower surface of the body :each side of :the sl'ot.

I Signed at Grand Rapids: Mi hi vember: 15, 1912. Y i 7 THOMAS DEMBSTER, J 1i; In-p1esence of I;

LJS GILLEY, 7 7 ERNEST G. GEARHART,

Copies of this patent may be obtained for five cents each; by addressingthe' Commissioner pfiIIPatents,

Washington, D. 0. e a 

